Watch five billion years of what might be the cosmic future. This simulation starts with the current positions of the Milky Way and Andromeda Galaxies. As they evolve they fall toward each other and eventually collide. The red dots represent globular star clusters.

Credits:The simulation was performed by Yuexing Li & Mordecai-Mark Mac Low (AMNH) and John Dubinski (U Toronto) on Lemieux, using the SPH code GADGET written by Volker Springel (MPI for Astrophysics) and collaborators, and the animation was prepared by Erik Wesselak & Carter Emmart (AMNH).